Many moths can be sexed by looking at their antennae. Pyraustinids are not so easy because both males and females have filiforma antennae.

But there is something else that we can consider. The tibia on the middle legs of males of some Pyraustinids have a tuft of androconial scales. However, I am not sure I can see that on your photo, and I am not sure if it applies to Pyrausta despicata. Sorry.